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CVE-2026-23795 Apache Syncope

Affected softwareApache Syncope
Severity4.9 Medium CVSS 3.1
Fixed in3.0.16, 4.0.4
WeaknessXML external entity (XXE) (CWE-611)
Published3 Feb 2026
Updated17 Jun 2026

Description

Improper Restriction of XML External Entity Reference vulnerability in Apache Syncope Console. An administrator with adequate entitlements to create or edit Keymaster parameters via Console can construct malicious XML text to launch an XXE attack, thereby causing sensitive data leakage occurs. This issue affects Apache Syncope: from 3.0 through 3.0.15, from 4.0 through 4.0.3. Users are recommended to upgrade to version 3.0.16 / 4.0.4, which fix this issue.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 2.0% chance in 30 days

Waratek protection

Protected by Waratek

Waratek has a rule that blocks attacks on this vulnerability.

  • Protection full XXE
  • Action available security rule
  • Review automated Inferred
  • Record active
Decided by A vulnerability class already blocked by an ARMR security rule
Finding Protected by Waratek's ARMR xxe security rule, which blocks this class of attack at the JVM level without a rule written for this CVE specifically. The CVE's weakness is CWE-611: XML External Entity Reference.

How to mitigate CVE-2026-23795

Upgrade Apache Syncope to a release that fixes it: 3.0.16 or 4.0.4. Until you can, Waratek RASP blocks exploitation with its XXE rule. It runs inside the Java application, with no code changes.

Waratek RASP Runtime protection for Java applications

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.syncope.client.idrepo:syncope-client-idrepo-console 3.0.0 3.0.16 unbounded
org.apache.syncope.client.idrepo:syncope-client-idrepo-console 4.0.0 4.0.4 unbounded

Products and versions

2 products, 4 version entries
SourceVendorProductSchemeAffected versions
nvd apache syncope generic ≥ 3.0.0 and < 3.0.16 · ≥ 4.0.0 and < 4.0.4
osv org.apache.syncope.client.idrepo syncope-client-idrepo-console generic ≥ 3.0.0 and < 3.0.16 · ≥ 4.0.0 and < 4.0.4

References

URLTags
https://github.com/apache/syncope PACKAGE
https://lists.apache.org/thread/mzgbdn8hzk8vr94o660njcc7w62c2pos WEB
http://www.openwall.com/lists/oss-security/2026/02/02/2 WEB

Timeline

Published2026-02-03By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.